[Android][Playlists] Song disappeaing from playlist.

[Immaterialist]

Sometimes I find that songs in a playlist  are no longer possible to listen to, which is understandable if the song is not available on Spotify anymore. However, it has happened a few times that when I search for that particular song with the same artist, it's still on Spotify anyway. I suppose what happened was that the song was removed from Spotify and at a later time made available again. What I would like to see, is that the song then would reappear in the playlist. Obviously, the information about  which songs was removed is avalable, since you can still see them in the playlist if you have selected that option in the settings.